UFC 105

Lore & Background

The Penn-Sonnen rivalry began at UFC 79 in 2007, when the two welterweights clashed in a chaotic, back-and-forth affair that left fans split and both fighters nursing a deep personal animosity. Their rematch at UFC 87 in 2008 only deepened the wound, with Sonnen's aggressive pressure and Penn's unorthodox counter-striking creating a narrative that the UFC leaned into heavily in promotional material. B.J. Penn entered the night as the underdog in many fans' eyes, having suffered a setback just weeks earlier.

Chael Sonnen, meanwhile, carried the momentum of a fighter who saw himself as the division's rightful heir. The main event delivered a sharp, tactical Round 1 before Penn's pressure and grappling in Round 2 produced a TKO that ended the trilogy on his terms. For a generation of fans who had followed both fighters since their early-2000s sparring sessions and training-camp videos, the finish felt like a period at the end of a long, messy sentence.

It is a card that fans from that era still reference when discussing what made the sport feel like a story rather than just a bracket.

Reader's Guide

Penn def. - Penn's unorthodox striking and grappling pressure were the story of the night; the TKO in Round 2 gave the trilogy a decisive, non-draw conclusion that satisfied years of fan speculation. - The card exemplified the UFC's early-2000s philosophy of building events around multi-fight narratives and personal animosity, a storytelling model that shaped how the promotion marketed its sport for a decade.

Did You Know?

• The Penn-Sonnen trilogy is often cited by fans as one of the most personal and narratively driven rivalries in UFC history, predating the sport's later emphasis on title unification.
• The MGM Grand Garden Arena in Las Vegas became a recurring UFC venue during this era, hosting multiple numbered events that anchored the promotion's West Coast identity.
• B.J. Penn was known for an unorthodox, almost improvisational fighting style that made his bouts unpredictable and gave the trilogy a unique texture compared to more conventional welterweight matchups.